/Engine/Plugins/Cameras/GameplayCameras/Source/GameplayCameras/Public/LegacyCameraShake.h
It doesn't do anything because, for backwards compatibility reasons, all the data was left on the shake class itself... so this pattern delegates everything back to the owner shake.
[UCLASS](Programming/UnrealArchitecture/Reference/Classes#classdeclaration)(HideDropDown) class ULegacyCameraShakePattern : public [UCameraShakePattern](API\Runtime\Engine\Camera\UCameraShakePattern)